Al-Hakam bin Fadalah said: I asked Sayyiduna Abu Umamah (may Allah be pleased with him), and the work of those who collect the charity was mentioned before him, so he said: "Charity is a duty, and its collectors will be in the Fire; this is the saying of the Messenger of Allah (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7960